I have a 3 month old who loves to sleep and play in his Graco backpack. I use the mattress that comes with it and it's incredibly thin - about 1 inch, which is probably why I was concerned about finding a sheet that wasn't too big as they all seem to be 4 or 5 inch pockets. I searched and read many reviews and settled on these as someone said they look like Lularoe leggings. This is perfection! Just like the buttery soft fabric of my favorite leggings, plus they're breathable thin material (but not the cheap kind) so he doesn't get hot. I slept like a baby on it! I love that there are 2 packs so I can flip them when they get baggy. They are perfect for PNP mattresses. The elastic band is trained in such a way that there are no wrinkles. I think I could easily install them on an aftermarket mattress upgrade depending on how they fit under the mattress. Consider a different pack for convenience as my LO is an avid drool and spittoon. Only thing I wish they had more than the two prints I could find but the ones I got are amazing.
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